Sean is interested in getting a wireless 5.1 surround sound system. Leo says he understands the desire to get rid of wires, but they often don't work as well due to interference in the audio spectrum. It's also why he hired someone to wire his house and put them inside the walls. Wireless left/right and center speakers are OK because they're usually not that far away from each other. But surround is usually farther away.
Scott Wilkinson recommends the Pioneer Surround Sound system designed by Andrew Jones (SP-PK52FS) for $549. It includes standing speakers and bookshelf speakers. But they're not wireless in the back. It's a great price though.
Polk makes a great wireless setup as well, called the F/X Surround Sound system, for about $200.